Dissertation > Excellent graduate degree dissertation topics show

Two Dimension Structural Sound Radiation Mode Sensor is Designing in ASAC System

Author: WuJinWu
Tutor: JiangZhe
School: Jiangsu University
Course: Power Machinery and Engineering
Keywords: radiation modes adjoint coefficient error sensor piezoelectric film active structural acoustic control (ASAC)
CLC: TP212
Type: Master's thesis
Year: 2003
Downloads: 99
Quote: 0
Read: Download Dissertation


In order to reduce sound radiation of a structure, the method of Active Structural Acoustic Control (ASAC) was developed in the 1980s. People are interested in the study of ASAC system based on the radiation modes of radiation structure in recent years, and the system can reduce sound radiation power by controlling radiation modes. The aim of ASAC is to control radiation power. Because radiation modes are orthogonal each other, the corresponding sound power of each order radiation mode is completely independent. Radiation modes are dependent on the radiator’s geometry shape and vibration frequency, but are not relative to the material characteristic and the border condition of the radiator. Further more, the radiation efficiency of the radiation modes falls off very rapidly with the increase of modes order at low frequency .The adjoint coefficient of sound radiation modes is proportional to the corresponding sound radiation power.The total sound radiation power can be reduced by counteracting the adjoint coefficients of sound radiation modes of the first N radiation modes. That is to say, in order to measure the adjoint coefficients of sound radiation modes, we should design the particular shape of error sensor. As a new kind of piezoelectricity macromolecule material, PVDF (Polyvinylidene fluoride) has not only lower density, but also better piezoelectricity, good mechanical performance and plasticity .When aparticular shaped PVDF film is used as an error sensor and is bonded to the surface of the measured structure, there will be little effect on the system.According to the integral characteristic of PVDF film, two PVDF sensors are designed to measure adjoint coefficient of sound radiation mode in this paper. Based on the theory of sound radiation and two-dimensional modal sensors equation, and taking a simply supported plate as example, we measure mode l,mode 2 and mode 3 adjoint coefficient of its sound radiation by the sensors. Finally, by numerical calculation we can conclude that the particular shaped PVDF that act as error sensor is desirable.

Related Dissertations

  1. Cylindrical shell surface vibrations and radiated sound field reconstruction forecasts modal analysis method,TB535
  2. The Application of the Decoupling of the Active Structural Acoustic Control Based on the Theory of Radiation Modes,TB535
  3. Design of Robust Controller in ASAC Based on the Radiation Modes,TB535
  4. Modal model based on acoustic radiation sensitivity of solving acoustic,TB52
  5. The Acoustic Fields Reconstruction Based on the Acoustic Radiation Modes and Its Application,TB535
  6. The Research on Vibro-acoustic Characteristics of Fliud-loaded Damaged Elastic Plate,U661.4
  7. Long period fiber grating mode field and coupled,TN25
  8. Based on acoustic radiation modes Active Structural Acoustic Control Strategy Control,TB532
  9. Research on Sound Radiation of the Plate with Two Opposite Sides Simply Supported and Other Two Free,TB532
  10. Theories and Techniques for Active Control of Structural Acoustic Radiation and Transmission,U661.43
  11. Gradual Event Detection in Sensor Networks,TP212.9
  12. Data Aggregation Scheduling Algorithms in Wireless Sensor Networks,TP212.9
  13. Research on Target Tracking and System in Wireless Sensor Networks Based on Character of Movement and Terrain Restriction,TP212.9
  14. Technology for Localization Attack Detection in Wireless Sensor Networks,TP212.9
  15. Multiple Pairwise Keys Management Protocol of Function Node-Based for Wireless Sensor Networks,TP212.9
  16. Research of Secure Distributed Cluster Wireless Sensor Network Routing Based on LEACH,TP212.9
  17. Research on Intrusion Detection Technology of Wireless Sensor Networks Based on Behavior Trust,TP212.9
  18. Region-based wireless sensor network key management scheme for research,TP212.9
  19. Mobile WSN data collection based on the virtual cluster head Strategy,TP212.9
  20. Information-oriented physical systems IEEE802.15.4MAC protocol analysis and optimization,TP212.9
  21. Multilayer structure based WSN routing protocol for heterogeneous clusters,TP212.9
  22. Research on the Spectral Characteristics and Sensing Applications of Photonic Crystal Fiber Grating,TP212

CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
© 2012 www.DissertationTopic.Net  Mobile